Just-in-Time or Just-in-Case? A Working Guide to Choosing Your Inventory Posture
For two decades, lean inventory was treated as settled doctrine: hold as little stock as possible, pull material only as you need it, and let suppliers absorb the timing risk. Then a year and a half of port backlogs, container shortages and factory shutdowns turned that doctrine into a liability for many organizations. The honest answer is not to abandon just-in-time, nor to hoard everything just-in-case. It is to decide, item by item, which posture each part of your supply chain actually warrants.
Just-in-time (JIT) minimizes the inventory you carry by synchronizing replenishment to real demand. It frees up cash and warehouse space and exposes quality problems quickly. Just-in-case (JIC) deliberately holds buffer stock so that a disruption upstream does not stop your operation. JIT optimizes for cost; JIC optimizes for continuity. Neither is right for an entire catalogue, and treating them as a company-wide philosophy is where most teams go wrong.
Segment before you decide
A single posture across thousands of SKUs is a false economy. Sort your items first, then assign a posture to each segment. A few lenses do most of the work:
Criticality: would a stockout halt production, breach a contract, or merely inconvenience someone?
Lead time and variability: a part that takes twelve weeks and arrives unpredictably behaves nothing like one available next day.
Value and shelf life: expensive or perishable goods punish over-buffering; cheap, stable ones forgive it.
Demand pattern: steady, forecastable demand suits JIT; lumpy or seasonal demand often needs a buffer.
Sourcing risk: single-source, single-region, or politically exposed supply deserves a cushion regardless of cost.
A step-by-step approach
Build the item profile. Pull the last 18–24 months of demand, lead times and actual delivery performance per item. The pandemic period is noisy, so look at both the disrupted and the stable stretches rather than averaging them into mush.
Score criticality and risk. Rate each item on impact-of-stockout and supply fragility. The combination, not either alone, tells you where buffers earn their keep.
Size the buffer deliberately. For JIC items, calculate safety stock from demand variability and lead-time variability, plus an explicit reorder point. A buffer should be a number you can defend, not a comfort blanket.
Keep JIT where it is safe. For low-risk, short-lead, forecastable items, hold the line on lean replenishment. Carrying cost is real, and not every part needs insurance.
Add resilience beyond stock. Qualify a second supplier, negotiate flexible volume terms, or shorten lead times. These often beat raw inventory as a hedge and cost less to carry.
Review on a schedule. Postures drift as suppliers, demand and routes change. Revisit segmentation quarterly so last year's emergency buffer does not quietly become this year's dead stock.
Hybrid is normal and healthy. A mature operation runs JIT on the bulk of its catalogue while deliberately buffering a small set of critical, fragile, long-lead items. The discipline is in the word deliberately: every buffer should trace back to a documented reason, and every lean line should be one you have confirmed is genuinely low-risk. When auditors, board members or funders ask why you hold what you hold, that documented logic is the answer.
If you are rebalancing inventory posture after a disruptive stretch, XNM's procurement, sourcing & contract management can help you segment items, size buffers defensibly, and build resilience into your supplier agreements.